This paper investigates the dynamic and mechanical limitations of the occluded ear simulator and pinna standardized in the IEC 60318 series. A modified ear simulator is introduced based on a low noise microphone. Also discussed is a new rubber pinna and ear canal based on an average of 260 measured human ear canals. Measurement examples using consumer audio headphones are shown and discussed. Results indicate improved repeatability in measurements as well as the possibility of measuring at sound pressure levels close to and below the threshold of human hearing.
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